[pulseaudio-discuss] audio left and right channels from microphone are L+R and L-R

Thomas Lynch thomas.walker.lynch at gmail.com
Sat Dec 2 14:01:38 UTC 2017


Please include my email address in replies.

This laptop has two built in microphones on the lid.

I've been running sound tests using the pulse audio sound control to turn
down the gain on the right or alternatively, left, microphone, then using
audacity to monitor the results.  (I have also used gnome-sound recorder
and skype to monitor the results, as they are a bit surprising.)

The right channel is being sent to audacity as L+R.   The left channel is
being sent to audacity as as L-R.   Yes, it took a while to figure this out.

The new Skype client is using only the left microphone, so the sound
quality is very poor, near perfect cancellation at any distance from the

1. Has anyone run across this before?  Is this a known problem?
2. Is there a simple test for microphone channel input that can be used to
determine if this is a hard problem or a driver problem?
3. is there a way to turn off the left and cross the right channel into the
left at a low level?  I dont need stereo on the microphone on this machine,
at least not now as I am traveling.

Thank you so much for helping with this.

Thomas.Walker.Lynch at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20171202/a6efd821/attachment-0001.html>

More information about the pulseaudio-discuss mailing list